1905 Payroll, 1904 St. Paul City Directory and 1905 Census. Norwegian Peter Ingerson was born in 1855 and emigrated with his wife in 1882. He worked as a laborer on the Capitol construction. The Ingersons lived at 190 1/2 Martin (now W. Central Avenue). Peter's son, Carl Ingerson, was a musician and activist in the Musicians Union who later became a physician and served as Ramsey County Coroner from 1918 to 1955.

Most of the workers who constructed the Minnesota Capitol belonged to unions. However, it is not clear whether St. Paul laborers were organized during the period when the Capitol was built nor how many laborers or which jobs were represented by a union between 1896 and 1907. So Ingerson's union status is currently unknown.